ArticleFrontiers in microbiology2016
Anaerobic Nitrogen Turnover by Sinking Diatom Aggregates at Varying Ambient Oxygen Levels.
Article in Frontiers in microbiology, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.
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Who cites it
21 citing papers in PubMed.
- Hydrostatic pressure induces strong leakage of dissolved organic matter from "marine snow" particles.Science advances · 2026Article
- Cold seep nitrogen fixation and its potential relationship with sulfur cycling.Microbiology spectrum · 2024Article
- Article
- Particle-associated denitrification is the primary source of NNature communications · 2023Article
- Microscale dynamics promote segregated denitrification in diatom aggregates sinking slowly in bulk oxygenated seawater.Communications earth & environment · 2023Article
- Inherent tendency ofScience advances · 2022Article
- Respiration by "marine snow" at high hydrostatic pressure: Insights from continuous oxygen measurements in a rotating pressure tank.Limnology and oceanography · 2021Article
- Denitrifying bacteria respond to and shape microscale gradients within particulate matrices.Communications biology · 2021Article
- Discovery and quantification of anaerobic nitrogen metabolisms among oxygenated tropical Cuban stony corals.The ISME journal · 2021Article
- Nitrogen removal processes in lakes of different trophic states from on-site measurements and historic data.Aquatic sciences · 2021Article
- The Genomic Capabilities of Microbial Communities Track Seasonal Variation in Environmental Conditions of Arctic Lagoons.Frontiers in microbiology · 2021Article
- Distinct nitrogen cycling and steep chemical gradients in Trichodesmium colonies.The ISME journal · 2020Article
- Freshwater copepod carcasses as pelagic microsites of dissimilatory nitrate reduction to ammonium.FEMS microbiology ecology · 2018Article
- A new mathematical model to explore microbial processes and their constraints in phytoplankton colonies and sinking marine aggregates.Science advances · 2018Article
- Diazotrophs and NFrontiers in microbiology · 2018Article
- Effect of settled diatom-aggregates on benthic nitrogen cycling.Limnology and oceanography · 2018Article
- Adaptability as the key to success for the ubiquitous marine nitrite oxidizerScience advances · 2017Article
- Niche Partitioning of the N Cycling Microbial Community of an Offshore Oxygen Deficient Zone.Frontiers in microbiology · 2017Article
- Ecological Energetic Perspectives on Responses of Nitrogen-Transforming Chemolithoautotrophic Microbiota to Changes in the Marine Environment.Frontiers in microbiology · 2017Review
- Microbial Community Structure of Subglacial Lake Whillans, West Antarctica.Frontiers in microbiology · 2016Article
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4 authors.
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No grant is acknowledged in the PubMed record.
Abstract
In the world's oceans, even relatively low oxygen levels inhibit anaerobic nitrogen cycling by free-living microbes. Sinking organic aggregates, however, might provide oxygen-depleted microbial hotspots in otherwise oxygenated surface waters. Here, we show that sinking diatom aggregates can host anaerobic nitrogen cycling at ambient oxygen levels well above the hypoxic threshold. Aggregates were produced from the ubiquitous diatom Skeletonema marinoi and the natural microbial community of seawater. Microsensor profiling through the center of sinking aggregates revealed internal anoxia at ambient 40% air saturation (∼100 μmol O2 L(-1)) and below. Accordingly, anaerobic nitrate turnover inside the aggregates was evident within this range of ambient oxygen levels. In incubations with (15)N-labeled nitrate, individual Skeletonema aggregates produced NO2 (-) (up to 10.7 nmol N h(-1) per aggregate), N2 (up to 7.1 nmol N h(-1)), NH4 (+) (up to 2.0 nmol N h(-1)), and N2O (up to 0.2 nmol N h(-1)). Intriguingly, nitrate stored inside the diatom cells served as an additional, internal nitrate source for dinitrogen production, which may partially uncouple anaerobic nitrate turnover by diatom aggregates from direct ambient nitrate supply. Sinking diatom aggregates can contribute directly to fixed-nitrogen loss in low-oxygen environments in the ocean and vastly expand the ocean volume in which anaerobic nitrogen turnover is possible, despite relatively high ambient oxygen levels. Depending on the extent of intracellular nitrate consumption during the sinking process, diatom aggregates may also be involved in the long-distance export of nitrate to the deep ocean.
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